A heat dissipation insulating gasket structure for resistor

Abstract

The present invention discloses a heat dissipation insulating gasket structure for a resistor, comprising: an insulating gasket, a first heat conductive plate and a second heat conductive plate, a first boss protrudes from the middle of the end surface of one end of the insulating gasket, a second boss protrudes from the middle of the end surface of the other end of the insulating gasket, the first boss, the insulating gasket and the second boss are all annular, forming a channel penetrating the middle of the first boss, the insulating gasket and the second boss, the first heat conductive plate is attached to the end surface of one end of the insulating gasket, the second heat conductive plate is attached to the end surface of the other end of the insulating gasket, the end surface of the first heat conductive plate facing the end of the insulating gasket is a smooth surface, the end surface of the first heat conductive plate facing the end of the insulating gasket is a patterned surface, the end surface of the second heat conductive plate facing the other end of the insulating gasket is a smooth surface, and the end surface of the second heat conductive plate facing the other end of the insulating gasket is a patterned surface. The present invention solves the problem of friction between the annular resistor and the resistor insulating rod under the action of electric power, and has a good heat dissipation effect.

Description

Technical Field

[0001] The invention relates to the technical field of high voltage equipment, and in particular to a heat dissipation insulating gasket structure for a resistor. Background Art

[0002] like Figure 1 As shown, a resistor insulating rod 8 is inserted into the ring of the existing annular resistor 7 connected in series in the circuit. The annular resistor 7 and the resistor insulating rod 8 are not tightly matched. An annular conductive copper sheet 9 is provided on both end faces of the annular resistor 7. The gasket 10 is annular. A gasket 10 is sandwiched between two adjacent layers of annular resistors 7. The resistor insulating rod 8 passes through the gasket 10. When current flows through the annular resistor 7, a large electric force will be generated. The annular resistor 7 moves under the action of the electric force, causing the annular resistor 7 and the resistor insulating rod 8 to continuously rub against each other, resulting in a decrease in insulation strength, which eventually causes the annular resistor 7 to discharge to the insulating material, affecting the safe and reliable operation of the power system. Figure 2 As shown, when the annular resistor 7 deviates from the equilibrium position due to some factors, assuming that the direction of the current I is vertically upward at this time, the direction of the magnetic field is perpendicular to the paper surface and inward, and the annular resistor 7 that is offset to the right will be subjected to an electric force F pointing to the equilibrium position and accelerate to the equilibrium position. At this time, the speed reaches the maximum value, and then crosses the equilibrium position to decelerate until it collides and rebounds with the resistor insulation rod 8. This is repeated, and the insulation will be damaged. When the annular resistor 7 is short-circuited and punctured during operation, the high-amplitude surge current will cause the annular resistor 7 to generate more heat. If the heat is not dissipated in time, it will affect the normal use of the annular resistor 7 and the gasket 10, and even cause an explosion. Specifically, taking the closing resistor of the circuit breaker for the 750kV AC filter of the converter station as an example, the closing resistor has a resistance of 1500Ω and is composed of 105 annular resistors 7. The resistance of a single piece is 14.28Ω, the outer diameter is 15cm, the inner diameter is 3.5cm, the thickness is 2.5cm, and the volume V=π×(D0 2 -D1 2 )×L / 4=417.7cm 3 , specific heat capacity c m =2J·cm -3 ℃ -1. Calculated by simulation software, under normal circumstances, when the filter is put into operation, the closing resistor is put into operation for 10ms, the maximum heat absorption of the closing resistor is 680kJ, and the temperature rises by 7.8℃, which has little impact. Assuming that a flashover breakdown occurs during the closing process, a total of 100 annular resistors 7 are short-circuited, and the actual resistance value drops to 71Ω. Similarly, it can be calculated from the simulation that the maximum heat absorption of the closing resistor at this time is 277kJ. At this time, the temperature of the annular resistor 7 will rise by 66℃. If other fault conditions are superimposed, the temperature rise will be more serious. Failure to dissipate heat in time will cause serious damage to the safe operation of the equipment. In addition, for the closing resistor used in the circuit breaker, it bears more serious closing inrush current and overvoltage. After the cumulative effect of multiple closing operations, the surface of the resistor insulating rod 8 is more prone to surface discharge. Summary of the invention

[0003] The embodiment of the present invention provides a heat dissipation insulating gasket structure for a resistor to solve the problem in the prior art that the resistor moves under the action of electric force, causing continuous friction between the resistor and the insulating rod, resulting in reduced insulation strength.

[0004] The embodiment of the present invention discloses the following technical solution:

[0005] A heat dissipation insulating gasket structure for a resistor comprises: an insulating gasket, a first heat conductive plate and a second heat conductive plate, wherein a first boss protrudes from the middle of an end surface of one end of the insulating gasket, and a second boss protrudes from the middle of an end surface of the other end of the insulating gasket, the first boss, the insulating gasket and the second boss are all annular, forming a channel that passes through the middle of the first boss, the insulating gasket and the second boss, the first heat conductive plate is attached to the end surface of one end of the insulating gasket, and the second heat conductive plate is attached to the end surface of the other end of the insulating gasket, the end surface of the first heat conductive plate facing one end of the insulating gasket is a smooth surface, and the end surface of the first heat conductive plate facing away from the end of the insulating gasket is a patterned surface, the end surface of the second heat conductive plate facing the other end of the insulating gasket is a smooth surface, and the end surface of the second heat conductive plate facing away from the other end of the insulating gasket is a patterned surface.

[0006] Further: the first heat conducting plate and the second heat conducting plate are both ring-shaped.

[0007] Further: the insulating gasket, the first boss and the second boss are integrally formed.

[0008] Further: the material of the insulating gasket is epoxy resin or polytetrafluoroethylene.

[0009] Further: the first heat conductive sheet and the second heat conductive sheet are made of silicone.

[0010] The heat dissipation insulating gasket structure for the resistor in the embodiment of the present invention solves the problem of the annular resistor constantly rubbing against the resistor insulating rod under the action of the electric force generated by a large current by internally limiting the annular resistor and the conductive copper sheet, and can conduct heat away in time when the annular resistor short-circuit breaks down, avoiding local overheating that damages the insulation and even causes an explosion, thereby ensuring the reliable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0012] Figure 1 It is a schematic diagram of the assembly structure of the annular resistor and the gasket in the prior art;

[0013] Figure 2 It is a resistance vibration principle diagram of a ring-shaped resistor sheet in the prior art;

[0014] Figure 3 is a structural schematic diagram of a heat dissipation insulating gasket structure according to an embodiment of the present invention;

[0015] Figure 4 1 is a schematic diagram of the assembly structure of the annular resistor and the heat dissipation insulating gasket structure according to an embodiment of the present invention;

[0016] Figure 5 This is a heat transfer diagram when the annular resistor of the embodiment of the present invention breaks down. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The present invention discloses a heat dissipation insulating gasket structure for a resistor sheet, which is particularly suitable for a closing resistor, especially a closing resistor of a 750kV filter circuit breaker. Figures 3 to 5 As shown, the heat dissipation insulating gasket structure includes: an insulating gasket 1, a first heat conducting plate 2 and a second heat conducting plate 3.

[0019] A first boss 4 protrudes from the middle of the end surface of one end of the insulating gasket 1. A second boss 5 protrudes from the middle of the end surface of the other end of the insulating gasket 1. The insulating gasket 1, the first boss 4 and the second boss 5 can be integrally formed. The insulating gasket 1 is made of epoxy resin or polytetrafluoroethylene material. The first boss 4, the insulating gasket 1 and the second boss 5 are all annular, and their annular shapes are opposite to each other, forming a channel 6 that passes through the middle of the first boss 4, the insulating gasket 1 and the second boss 5.

[0020] The first heat conductive sheet 2 is attached to the end surface of one end of the insulating gasket 1. The first heat conductive sheet 2 is annular and is sleeved outside the first boss 4. The end surface of the first heat conductive sheet 2 facing the insulating gasket 1 is a smooth surface. The end surface of the first heat conductive sheet 2 facing away from the insulating gasket 1 is a patterned surface, so as to have an anti-slip function. The first heat conductive sheet 2 is made of an insulating heat conductive silicone sheet.

[0021] The second heat conductive sheet 3 is attached to the end surface of the other end of the insulating gasket 1. The second heat conductive sheet 3 is annular and is sleeved outside the second boss 5. The end surface of the second heat conductive sheet 3 facing the other end of the insulating gasket 1 is a smooth surface. The end surface of the second heat conductive sheet 3 facing away from the other end of the insulating gasket 1 is a patterned surface, so as to have an anti-slip function. The second heat conductive sheet 3 is made of an insulating heat conductive silicone sheet. Preferably, the second heat conductive sheet 3 has the same size as the first heat conductive sheet 2.

[0022] like Figure 4 As shown, when in use, a heat dissipation insulating gasket structure according to an embodiment of the present invention is arranged between each two adjacent layers of annular resistor sheets 7. Specifically, the insulating gasket 1 is located between two adjacent layers of annular resistor sheets 7. Because conductive copper sheets 9 are arranged at both ends of the annular resistor sheets 7, and the first thermal conductive sheet 2 and the second thermal conductive sheet 3 are arranged at both ends of the insulating gasket 1, the first thermal conductive sheet 2 contacts the conductive copper sheet 9 arranged on the end surface of the annular resistor sheet 7 adjacent thereto, and the second thermal conductive sheet 3 contacts the conductive copper sheet 9 arranged on the end surface of the annular resistor sheet 7 adjacent thereto. The channel 6 that passes through the middle of the first boss 4, the insulating gasket 1 and the second boss 5 is directly opposite to the ring shape of the annular resistor 7 and the conductive copper sheet 9. The resistor insulating rod 8 is inserted into the channel 6 that passes through the middle of the first boss 4, the insulating gasket 1 and the second boss 5, the ring shape of the annular resistor 7 and the ring shape of the conductive copper sheet 9. The first boss 4 is inserted between one of the two adjacent layers of annular resistor sheets 7 and the resistor insulating rod 8, and the second boss 5 is inserted between the other of the two adjacent layers of annular resistor sheets 7 and the resistor insulating rod 8.

[0023] The first boss 4 and the second boss 5 of the heat dissipation insulating gasket structure can be used as a protective cover for the annular resistor 7 to achieve internal limit of the annular resistor 7 and avoid friction between the annular resistor 7 and the resistor insulating rod 8. The patterned surface of the first heat conductive sheet 2 and the second heat conductive sheet 3 can avoid friction between the conductive copper sheet 9 and the insulating gasket 1, thereby avoiding a reduction in the insulation strength between the annular resistor 7 and the resistor insulating rod 8. When the annular resistor 7 is short-circuited and broken down during operation, a high-amplitude surge current will cause the annular resistor 7 to generate more heat, such as Figure 5 As shown by the arrows, at this time, the heat can be taken away in time by the first heat conducting sheet 2, the second heat conducting sheet 3 and the conductive copper sheet 9 to avoid local overheating that damages the insulation and even causes an explosion.

[0024] In summary, the heat dissipation insulating gasket structure for the resistor in the embodiment of the present invention solves the problem of the annular resistor constantly rubbing against the resistor insulating rod under the action of the electric force generated by large current by internally limiting the annular resistor and the conductive copper sheet, and can conduct heat away in time when the annular resistor short-circuit breaks down, avoiding local overheating that damages the insulation and even causes an explosion, thereby ensuring the reliable operation of the equipment.

[0025] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A heat dissipation insulating gasket structure for a resistor, characterized in that: include: An insulating gasket, a first thermally conductive sheet and a second thermally conductive sheet, a first boss protrudes from the middle of an end surface of one end of the insulating gasket, a second boss protrudes from the middle of an end surface of the other end of the insulating gasket, the first boss, the insulating gasket and the second boss are all annular, forming a channel that passes through the middle of the first boss, the insulating gasket and the second boss, the first thermally conductive sheet is attached to the end surface of one end of the insulating gasket, the second thermally conductive sheet is attached to the end surface of the other end of the insulating gasket, the end surface of the first thermally conductive sheet facing one end of the insulating gasket is a smooth surface, the end surface of the first thermally conductive sheet facing away from the end of the insulating gasket is a patterned surface, the end surface of the second thermally conductive sheet facing the other end of the insulating gasket is a smooth surface, and the end surface of the second thermally conductive sheet facing away from the other end of the insulating gasket is a patterned surface; The first boss is inserted between one of two adjacent layers of annular resistor sheets and the resistor insulating rod, and the second boss is inserted between the other of the two adjacent layers of annular resistor sheets and the resistor insulating rod.

2. The heat dissipation insulating gasket structure for a resistor according to claim 1, characterized in that: The first heat conducting plate and the second heat conducting plate are both in annular shape.

3. The heat dissipation insulating gasket structure for a resistor according to claim 1, characterized in that: The insulating gasket, the first boss and the second boss are integrally formed.

4. The heat dissipation insulating gasket structure for a resistor according to claim 1, characterized in that: The insulating gasket is made of epoxy resin or polytetrafluoroethylene.

5. The heat dissipation insulating gasket structure for a resistor according to claim 1, characterized in that: The first heat conducting sheet and the second heat conducting sheet are made of silica gel.

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